| Alfaware A.E. | |
| allVoIP | Attica |
| Allweb Solutions S.A. | |
| Alma Technologies S.A. | Attica |
| Altnet | Attica |
| Amaze | Attica |
| AMD Telecom S.A. | Attica |
| American College of Greece | |
| American College of Thessaloniki | Central Macedonia |
| Amplus S.A. | |
| Anadelta Software | Attica |
| Anazitisi Online | Attica |
| Anfarm Hellas S.A. | |
| Angellight Services Ltd | Attica |
| Anodos Logistics Ltd | |
| Anova Consulting | Attica |
| Answer Computer Applications | Attica |
| Antinoos Software Applications | Attica |
| Antithesis Group | Attica |
| Antmoves | |
| Apifron | |
| Apogee Information Systems | Central Macedonia |
| Apopsinet | Attica |
| AppArt | |
| AppDate | |
| Applicality | Attica |
| Apptiva | |
| Aratos Space | |
| Aresti Power | |
| Arion Software | Attica |
| Aristotle University of Thessaloniki | |
| Aristotle University of Thessaloniki - AIIA Laboratory | |
| Aristotle University School of Medicine | |
| AroundWeb Ltd | |
| Art On Web | |
| ArtAbout | |
| Artemis ITS | Attica |
| Artificial Spirit | Central Macedonia |
| Artionweb Design | Attica |
| Artoo | Central Macedonia |
| ArtsPR | |
| Artware | |
| ASPiSYS Ltd | Attica |
| Association of Hellenic Internet Users | Attica |
| Astralon | |
| ATC S.A. | Attica |
| Atcom S.A. | Attica |
| Athena-Research and Innovation Center in Information, Communication and Knowledge Technologies | Attica |
| Athens Center for Entrepreneurship and Innovation | |
| Athens University of Economics and Business | |